Shape control of CdSe nanocrystals

✍ Scribed by Alivisatos, A. P.; Peng, Xiaogang; Manna, Liberato; Yang, Weidong; Wickham, Juanita; Scher, Erik; Kadavanich, Andreas

• Book ID: 109767829
• Publisher: Nature Publishing Group
• Year: 2000
• Tongue: English
• Weight: 573 KB
• Volume: 404
• Category: Article
• ISSN: 0028-0836
• DOI: 10.1038/35003535

✦ Synopsis

Milankovitch proposed that summer insolation at mid-latitudes in the Northern Hemisphere directly causes the ice-age climate cycles 1 . This would imply that times of ice-sheet collapse should correspond to peaks in Northern Hemisphere June insolation. But the penultimate deglaciation has proved controversial because June insolation peaks 127 kyr ago whereas several records of past climate suggest that change may have occurred up to 15 kyr earlier 2±8 . There is a clear signature of the penultimate deglaciation in marine oxygen-isotope records. But dating this event, which is signi®cantly before the 14 C age range, has not been possible. Here we date the penultimate deglaciation in a record from the Bahamas using a new U-Th isochron technique. After the necessary